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As documented in commits6a004be("[efi] Support the initrd autodetection mechanism in newer Linux kernels") and04e60a2("[efi] Omit EFI_LOAD_FILE2_PROTOCOL for a zero-length initrd"), the choice in Linux of using a fixed device path requires bootloaders to allow for the fact that a previous bootloader may have already installed a handle with the fixed device path. We currently deal with this situation by reusing the existing handle, replacing the EFI_LOAD_FILE2_PROTOCOL instance with our own. Simplify the code by instead uninstalling the EFI_DEVICE_PATH_PROTOCOL instance from the existing handle (if present), thereby allowing the creation of a new handle to succeed. Create the new handle only if we have a non-empty initrd to provide. This works around bugs in bootloaders such as the systemd EFI stub that fail to allow for the existence of multiple-bootloader chains. (The workaround is not comprehensive: if the user has downloaded other images in iPXE before invoking the systemd Unified Kernel Image (UKI), then the systemd EFI stub will still crash and burn since it fails to allow for the fact that a previous bootloader has already installed a handle with the fixed device path.) Signed-off-by: Michael Brown <mcb30@ipxe.org>
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